The effect of mini-structure on the dynamic variation of gas and water distribution in Sebei Ⅱ Gasfield,Qaidam Basin,China
Received date: 2017-01-07
Revised date: 2017-03-16
Online published: 2017-05-10
The aim of this paper is to critically investigatethe problem of prediction of the direction of edge water invasion and the adjustment of well pattern in the late stage of the development of Sebei Ⅱ Gasfield,by considering the characteristics of anticline gas reservoir with edge water.This research is based on the feature of mini-structure and the actual production data to analyze the controlling effect of mini-structure on the dynamic change of gas and water distribution in gas reservoir.Results showed that a gas-water boundary defined by the micro structure mapis more consistent with the actual production,whereby movable water saturation was significantly higher in the negative mini-structure.There is a high positive correlation between water invasion area and mobile water saturation.The average daily water production ofsingle well is 10.26 cubic meters in the negative mini-structure,and is 1.52 cubic meters in the positive mini-structure.It could be concluded that:(1)There is a good correlation between the distribution of the gas-water boundary and the distribution of the mini-structure of the gas reservoir,which indicates that the distribution of gas and water in the gas reservoir is obviously controlled by the distribution of the mini-structure.(2)The water invasion within the gas reservoir firstly occurs in the negative mini-structures such as small low and small grooves in the anticline.(3)In the negative mini-structure,the volume of edge-water is larger,the edge-water driving force is stronger,and edge-water carriesforward at a faster rate.(4)The method of effective development and reducing flooding velocity of gas reservoirs in the Sebei-2 Gasfield is to effectively control the gas production rate of the development wells on the negative mini-structures,and add new wells on the positive mini-structures to improve the well network.
Kui Ming-qing,Hu Wang-shui,Li Yu,Shen Run-kai,Cao Ji-hua . The effect of mini-structure on the dynamic variation of gas and water distribution in Sebei Ⅱ Gasfield,Qaidam Basin,China[J]. Natural Gas Geoscience, 2017 , 28(5) : 696 -702 . DOI: 10.11764/j.issn.1672-1926.2017.04.008
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